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Premature Ventricular Contractions Premature Ventricular Contractions Matthew B. Sellers MD, MS Cardiac Electrophysiology AnMed Health Arrhythmia Specialists [email protected] Disclosures • Under Accreditation Council for Continuing Medical Education guidelines, disclosure must be made regarding financial relationships with commercial interests within the last 12 months • Matthew B. Sellers MD, MS • I have no relevant financial relationships or affiliations with commercial interests to disclose Outline • Case • Prevalence • Mechanism • Associated conditions • Clinical presentation • Evaluation • Prognosis Case • 68yo WM with CAD s/p inferior MI c/b ischemic cardiomyopathy (EF 45%), RBBB, PVCs, NSVT presented with frequent PVCs and symptoms of fatigue and shortness of breath • No syncope, presyncope • Holter: 36,000 PVCs (30%), periods of bigeminy, trigeminy and NSVT • Intolerant to beta-blockers ECG Prevalence • Duration of monitoring • 1% on 12 lead ECG • 80% on 24 hour holter monitor Mechanism • Re-entry • Enhanced normal or abnormal automaticity • Triggered activity Associated Conditions • Hypertension with LVH • Acute myocardial infarction • Heart failure • Hypertrophic cardiomyopathy • Congenital heart disease • Idiopathic ventricular tachycardia • Other: OSA, COPD, pHTN, stimulants, endocrinopathies Clinical Presentation • Asymptomatic • Palpitations, lightheadedness • Anxiety • Palpitations anxiety catecholamine surge ectopy axiety • Reversible cardiomyopathy Evaluation • History, exam • 12 lead ECG • Ambulatory monitoring • Transthoracic echocardiogram • Exercise treadmill stress test • ? Electrolytes, OSA screening, UDS Electrocardiography • QRS duration > 120 msec • Bizarre morphology (not typical aberration) • T wave in opposite direction of main QRS • Fully compensatory pause RVOT PVCs Prognosis in “Normal Hearts” • ARIC single PVC on 2 minute ECG had 2 fold increase in mortality from CHD • ARIC 2 fold increase in sudden cardiac death • Meta-analysis 8 prospective studies (3,629 persons) PVC was associated with increased all cause mortality, cardiovascular mortality, SCD, or ischemic CHD (OR 1.72, 95% CI 1.28-2.31) • Meta-analysis 106,195 persons 1 PVC on 10 second ECG or >30 in 1 hour recording associated with overall cardiac mortality (RR 2.1, 95% CI 1.7-2.5) and SCD • Several cohort studies report no clinical significance Exercise • Withdrawal of vagal tone • Sympathetic stimulation increased circulating catecholamines • Increased HR, AV conduction, contractility • Increased cardiac output and oxygen delivery • Initiate abnormal automaticity, triggered activity, re- entry Cellular Mechanisms Specific Conditions • Exercise • Structural heart disease • Myocardial infarction • CHF Catecholaminergic PVT • Inherited disorder • Syncope, sudden death • Presents in children and teenagers • Structurally normal heart • Normal ECG • VT elicited by physical and emotional stress • Bidirectional ventricular tachycardia • Syncope or cardiac arrest before 40 • Beta-blockers, ICD Bidirectional VT Acute MI • PVCs are seen in the majority of MIs • <48 hours do not appear to affect prognosis • Conflicting data after 48 hours • PVCs carry a worse prognosis CHF • PVCs are very common in CHF • >10 per hour, incidence of NSVT is 90% • Prior MI associated with an increased risk of death, especially with LV dysfunction • NSVT does not add additional risk Treatment • Reserved for symptoms or cardiomyopathy • Beta blockers, CCB • Antiarrhythmic therapy • Catheter ablation CAST • PVCs are associated with an increased risk of sudden and nonsudden cardiac death after MI • 6 days to 2 years post MI • EF of less than 55% • Patients were randomly assigned after establishment of arrhythmia suppression Catheter Ablation • ACC/AHA Guidelines • Frequent, symptomatic, monomorphic PVCs • > 10,000 PVCs on 24 hour monitor • Drug resistant, or patient preference • Ventricular arrhythmia storm initiated by single PVC Conclusion • Repetitive monomorphic ventricular ectopy originating from the right ventricular outflow tract is an underappreciated cause of unexplained cardiomyopathy. • Successful ablation of the focal source of ventricular ectopy results in normalization of left ventricular function Case Conclusion Case Conclusion Conclusions • Most patients have PVCs • Symptoms, frequency • Structural heart disease • PVC cardiomyopathy is typically reversible with catheter radiofrequency ablation Questions.
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